GWD 02-Q2

[sugarcane]

這題精華區裡沒有，所以請問一下
Q2:
if n is a positive integer and the product of all the integer from 1 to n,inclusive,is divisible by 990,what is the least possible value of n?

A.8
B.9
C.10
D.11
E.12

答案是D
我想知道如何求得

[acharlie]

這題精華區裡沒有，所以請問一下
Q2:
if n is a positive integer and the product of all the integer from 1 to n,inclusive,is divisible by 990,what is the least possible value of n?

A.8
B.9
C.10
D.11
E.12

答案是D
我想知道如何求得

990=2x5x11x3^2
所以1x2x3x....n 一定要有11這個數字才可以被990整除
故n=11